Styrene and styrene dimer derivatives, cyclohexene, tert-butylbenzene and cumene as test reactions for acid strength measurements of crystalline and amorphous silica-aluminas, sulfated oxides and Amberlyst

摘要: The minimal HO values required for cyclohexene, α-methylstyrene, styrene, 2,4-diphenyl-4-methyl-1-pentene, 4-phenyl-1-butene, tert-butylbenzene and cumene to undergo the chosen test reactions over solid acids at 303 K have been established. the respective min obtained are as follows: α-methylstyrene styrene oligomerization (−3.3 −5.3), 2,4-diphenyl-4-methyl-1-pentene 4-phenyl-1-butene isomerization (−6.9 −7.9), cyclohexene (−7.8), disproportionation (−10.8) (−11.5). above mentioned were used study acid strength of different acids. results can be presented (a) γ-Al2O3 was practically inactive in performed due lack Bronsted centers HO ≤ −3.3; (b) −SO3H groups Amberlyst XN-1010 exhibit −7.9 < HO ≤ −7.8; (c) amorphous silica-alumina (13 45 % Al2O3), HY HZSM-5 zeolites possess sites −10.8 < HO ≤ −7.9; (d) sulfated oxides: Al2O3/(8 %)SO4 2− TiO2/(8 %)SO4 possesses strong protic −11.5 < HO ≤ −10.8.